CONTENTS 



Page 



I. General considerations, by Ales Hrdlicka 1 



II. Enumeration of the South American finds relating to early man, by Ales 



Hrdlicka H 



III. General geologic notes, by Bailey Willis 15 



Introductory note 15 



General geologic description 16 



Warped continental surface 16 



Pampean terrane 18 



Upper Pampean and Post- Pampean 27 



Atlantic coast of the pampas 32 



Summary of geologic relations 38 



Report on shells collected by Ales Hrdlicka and Bailey WilHs, in 



Argentina, by Wm. H. Ball 41 



IV. Tierra cocida; scoria?, by Bailey Willis 45 



Notes by Ales Hrdlicka 49 



V. Petrographic study of the specimens of loess, tierra cocida, and scoria 



collected by the Hrdlicka- Willis expedition, by Fred. Eugene Wright 



and Clarence N. Fenner 55 



Introduction 55 



Descriptions of specimens 57 



Specimens from Buenos Aires 57 



Specimens from Alvear 58 



Specimens from the vicinity of Mar del Plata 64 



Specimens from Miramar and vicinity 69 



Specimens from the vicinity of Necochea 80 



Specimens from Monte Hermoso 82 



Specimens from Rio Colorado 84 



Specimen from San Bias 85 



Recapitulation 86 



The loess specimens 86 



Tierra cocida 88 



The scoriae 89 



General conclusions and summary 93 



The scorice 94 



Petrographic-microscopic examination of bones collected by Doctor 



Hrdlicka 97 



VI. Peculiar stone industries of the Argentine coast, by Ales Hrdlicka 99 



Historical account 99 



The "split-stone " industry 99 



The "broken-stone" industry 104 



Field observations HI 



Worked stones of reputed geologic antiquity HI 



Conclusions 121 



Notes on Playa and Campo Pcralta, by Bailey Willis 122 



Notes on Punta Porvenir, by Bailey Willis 123 



IX 



